drm/i915/gvt/kvmgt: return meaningful error for vgpu creating failure

The vgpu_create() routine we called returns meaningful errors to indicate
failures, so we'd better to pass it to our caller, the mdev framework,
whereby the sysfs is able to tell userspace what happened.

Signed-off-by: Jike Song <jike.song@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>

diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c
index faaae07ae487277973533bbf907b6eefc2632a48..0c9234a87a20b3d0d6a1f7ddf9e789719a6244cd 100644 (file)
--- a/drivers/gpu/drm/i915/gvt/kvmgt.c
+++ b/drivers/gpu/drm/i915/gvt/kvmgt.c
@@ -398,6 +398,7 @@ static int intel_vgpu_create(struct kobject *kobj, struct mdev_device *mdev)
        struct intel_vgpu_type *type;
        struct device *pdev;
        void *gvt;
+       int ret;
 
        pdev = mdev_parent_dev(mdev);
        gvt = kdev_to_i915(pdev)->gvt;
@@ -406,13 +407,15 @@ static int intel_vgpu_create(struct kobject *kobj, struct mdev_device *mdev)
        if (!type) {
                gvt_err("failed to find type %s to create\n",
                                                kobject_name(kobj));
-               return -EINVAL;
+               ret = -EINVAL;
+               goto out;
        }
 
        vgpu = intel_gvt_ops->vgpu_create(gvt, type);
        if (IS_ERR_OR_NULL(vgpu)) {
-               gvt_err("create intel vgpu failed\n");
-               return -EINVAL;
+               ret = vgpu == NULL ? -EFAULT : PTR_ERR(vgpu);
+               gvt_err("failed to create intel vgpu: %d\n", ret);
+               goto out;
        }
 
        INIT_WORK(&vgpu->vdev.release_work, intel_vgpu_release_work);
@@ -422,7 +425,10 @@ static int intel_vgpu_create(struct kobject *kobj, struct mdev_device *mdev)
 
        gvt_dbg_core("intel_vgpu_create succeeded for mdev: %s\n",
                     dev_name(mdev_dev(mdev)));
-       return 0;
+       ret = 0;
+
+out:
+       return ret;
 }
 
 static int intel_vgpu_remove(struct mdev_device *mdev)